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Finding the Fourth Proportional to 138,903.61, 191,675.61 and 78,479.50

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Solution

The fourth proportional to 138,903.61, 191,675.61 and 78,479.50 is: 108,295.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,903.61 : 191,675.61 = 78,479.50 : x
  2. Step 2: Convert to fraction form
    138,903.61/191,675.61 = 78,479.50/x
  3. Step 3: Cross multiply
    138,903.61x = 191,675.61 × 78,479.50
  4. Step 4: Simplify right side
    138,903.61x = 15,042,606,035.00
  5. Step 5: Solve for x
    x = 15,042,606,035.00/138,903.61
  6. Step 6: Final answer
    x = 108,295.29

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.